EP1166978B1 - Plastic bag making apparatus - Google Patents

Plastic bag making apparatus Download PDF

Info

Publication number
EP1166978B1
EP1166978B1 EP01250215A EP01250215A EP1166978B1 EP 1166978 B1 EP1166978 B1 EP 1166978B1 EP 01250215 A EP01250215 A EP 01250215A EP 01250215 A EP01250215 A EP 01250215A EP 1166978 B1 EP1166978 B1 EP 1166978B1
Authority
EP
European Patent Office
Prior art keywords
waste
torn
pulled
station
rotating members
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01250215A
Other languages
German (de)
French (fr)
Other versions
EP1166978A3 (en
EP1166978A2 (en
Inventor
Mikio Totani
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Totani Corp
Original Assignee
Totani Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Totani Corp filed Critical Totani Corp
Publication of EP1166978A2 publication Critical patent/EP1166978A2/en
Publication of EP1166978A3 publication Critical patent/EP1166978A3/en
Application granted granted Critical
Publication of EP1166978B1 publication Critical patent/EP1166978B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/002—Precutting and tensioning or breaking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1827—Means for removing cut-out material or waste by tearing

Definitions

  • the invention relates to an apparatus according to the preambles of claims 1 and 13 for making plastic bags.
  • An example of such a device is shown in JP9295625A.
  • the apparatus includes feeding means by which the material 4 is intermittently fed for a length along a longitudinal feeding path.
  • the material 4 is heat sealed by heat seal means longitudinally and widthwise of the material 4 whenever intermittently fed and temporarily stopped so that heat sealed portions 5 can be formed longitudinally and widthwise of the material 4.
  • the material 4 may be slitted by slitting means along a slit line 6.
  • the apparatus is arranged to successively make plastic bags 2 with wastes 8.
  • Each of the wastes 8 has upstream and downstream edges 10 and 12.
  • the material 4 is totally cut by suitable cutting means along the upstream and downstream edges 10 and 12 of waste 8 whenever intermittently fed and temporarily stopped.
  • the wastes 8 are therefore brought into existence one by one or two by two by making shaped bags 2.
  • the waste 8 may be called a waste material or scrap.
  • a hole is usually formed under the feeding path of material so that the wastes can be dropped down through the hole to be removed.
  • the wastes 8 can neither always be dropped down nor removed even if the material 4 is totally cut.
  • the plastic bags 2 and the wastes 8 may adhere to each other by reason of certain factor such as static electricity, to be fed as they are.
  • the wastes 8 must therefore be removed later and manually by operator from the plastic bags 2, taking labours and times.
  • the hole through which the wastes 8 are dropped down it is required to change the size of hole when changing the size of plastic bag 2 and waste 8.
  • JP 2000 190403 A which was published an July 11, 2000, discloses an apparatus for making plastic bags from a web material comprising two or more layers of plastic film, said apparatus including feeding means by which said material is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags with wastes, each of said wastes having upstream and downstream edges. At first, these are formed micro connections between those parts of the web material which forms the plastic bags and the wastes, and thereafter the wastes are torn off.
  • the apparatus including feeding means by which the material is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags with wastes, each of the wastes having upstream and downstream edges.
  • Another object of the invention is to provide the apparatus in which the wastes can be removed automatically and reliably, without adhering to the plastic bags.
  • the partially cutting means comprises Thomson blade means opposed to the material.
  • the partially cutting means may further comprise drive means by which the Thomson blade means is moved toward the material so that the material can be partially cut by the Thomson blade means along the upstream and downstream edges of waste.
  • the Thomson blade means has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints formed and spaced from each other along the upstream and downstream edges of waste.
  • the micro joints make the material partially cut. The material and the waste are kept connected with each other by the micro joints.
  • the material is partially cut by the partially cutting means to be pulled and torn more easily at the downstream edge than at the upstream edge of waste.
  • the material is first pulled and torn by the discharge means from the downstream edge of waste after the waste reaches the second station and the material reaches the third station.
  • the waste is then pulled and torn by the waste removing means from the upstream edge of waste.
  • the waste removing means comprises upper and lower rotating members disposed on upper and lower sides of the feeding path.
  • the waste removing means further comprises drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between the upper and lower rotating members.
  • the waste removing means may comprise drive means by which at least one of the upper and lower rotating members is rotated at a considerable speed so that the waste can be pulled and torn by the upper and lower rotating members.
  • the discharge means advantageously comprises upper and lower belts between which the material is directed and sandwiched to be pulled and torn by the upper and lower belts.
  • the waste may be held by the waste removing means after reaching the second station so that the material can be pulled and torn by the discharge means from the downstream edge of waste. The waste is then pulled and torn by the waste removing means from the upstream edge of waste.
  • the waste removing means may comprise drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between and held by the upper and lower rotating members after reaching the second station.
  • the waste removing means may comprise upper and lower fingers disposed on upper and lower sides of the feeding path.
  • the waste removing means may further comprise drive means by which at least one of the upper and lower fingers is moved toward the waste so that the waste can be sandwiched between and held by the upper and lower fingers after reaching the second station.
  • the waste removing means preferably comprises drive means by which the upper and lower fingers are moved in a direction so that the waste can be pulled and torn by the upper and lower fingers.
  • the discharge means comprises drive means by which the upper and lower belts are driven at a first speed.
  • the waste removing means comprises drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between the upper and lower rotating members at the same time as the material is sandwiched between the upper and lower belts.
  • the waste removing means further comprises drive means by which at least one of the upper and lower rotating members is rotated at a second speed lower than the first speed so that the material is pulled and torn by the upper and lower belts, while the waste is pulled and torn by the upper and lower rotating members, by means of a difference in speed between the upper and lower belts and the upper and lower rotating members.
  • the partially cutting means of claim 13 preferably comprises drive means by which the Thomson blade means is moved toward the material so that the material can be partially cut by the Thomson blade means along the upstream edge of waste.
  • the optional micro joints of claim 15 make the material partially cut.
  • the waste is kept connected with the material by the micro joints.
  • the optional discharge means of claim 16 comprises upper and lower belts, the material being directed and sandwiched between the upper and lower belts to be discharged by the upper and lower belts.
  • the waste is then directed and sandwiched between the upper and lower belts to be pulled, torn and removed by the upper and lower belts.
  • Stop means is incorporated into the upper and lower belts so that the waste can strike against the stop means for dropping from the upper and lower belts.
  • Fig. 1 illustrates an apparatus for making plastic bags 2 from a web material 4 comprising two or more layers of plastic film, according to the invention.
  • Each of the plastic bags 2 comprises a shaped bag having opposite sides curved convexly or concavely, as in the case of the apparatus of Fig. 11.
  • the apparatus includes feeding means by which the material 4 is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags 2 with wastes 8.
  • Each of the wastes 8 has upstream and downstream edges 10 and 12.
  • the feeding means comprises upper and lower rollers 14 between which the material 4 is directed and sandwiched.
  • the upper and lower rollers 14 are rotated by drive means such as a servo motor so that the material 4 can be intermittently fed for a length.
  • the material 4 is heat sealed by heat seal means 16 longitudinally and widthwise of the material 4 whenever intermittently fed and temporarily stopped so that heat sealed portions 5 can be formed longitudinally and widthwise of the material 4.
  • the material 4 is slitted by slitting means along a slit line 6, as in the case of the apparatus of Fig. 11.
  • the apparatus further includes partially cutting means disposed at a first station predetermined along the feeding path of material 4.
  • the material 4 is partially cut by the partially cutting means along the upstream and downstream edges 10 and 12 of waste 8 whenever intermittently fed and temporarily stopped.
  • the partially cutting means includes Thomson blade means comprising a pair of Thomson blades 18 and 20 and opposed to the material 4.
  • the Thomson blades 18 and 20 are spaced from each other along the feeding path of material 4 and mounted on a carriage 22, the material 4 being directed between the Thomson blades 18 and 20 and a receiver 24.
  • the partially cutting means further includes drive means by which the Thomson blades 18 and 20 are moved toward the material 4 whenever the material 4 is intermittently fed and temporarily stopped.
  • the drive means comprises a linkage 26 by which the carriage 22 is connected to the heat seal means 16.
  • the Thomson blades 18 and 20 and the carriage 22 are therefore moved and lowered by the linkage 26 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped so that the material 4 can be sandwiched between the Thomson blades 18 and 20 and the receiver 24 to be partially cut by the Thomson blades 18 and 20 along the upstream and downstream edges 10 and 12 of waste 8.
  • each of the Thomson blades 18 and 20 has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints 28 and 30 formed and spaced from each other along the upstream and downstream edges 10 and 12 of waste 8, as shown in Fig. 3.
  • the micro joints 28 and 30 make the material 4 partially cut.
  • the material 4 and the waste 8 are kept connected with each other by the micro joints 28 and 30.
  • the micro joints 30 are less in number than the micro joints 28.
  • each of the micro joints 28 and 30 has a very small size of about 0.1 mm.
  • urethan rubbers 32 are disposed on the opposite sides of each of the Thomson blades 18 and 20 and mounted on the carriage 22, as shown in Fig. 2.
  • the urethan rubbers 32 are pressed against the material 4 and the receiver 24 to be elastically deformed so that the material 4 can be held by the urethan rubbers 32 when partially cut by the Thomson blades 18 and 20.
  • the carriage 22 and the Thomson blades 18 and 20 are then moved and lifted by the linkage 26 synchronously with the seal means 16 to be retracted from the material 4 and the receiver 24.
  • the urethan rubbers 32 are elastically restored to the original state so that the material 4 can be pushed by the urethan rubbers 32 to be separated from the Thomson blades 18 and 20. This prevents the material 4 from adhering to the Thomson blades 18 and 20.
  • the material 4 is therefore not pulled upwardly by the Thomson blades 18 and 20.
  • the apparatus further includes waste removing means disposed at a second station predetermined downstream of and at a distance from the first station at which the Thomson blades 18 and 20 are disposed.
  • the waste 8 reaches the second station when the material 4 is intermittently fed again after partially cut by the Thomson blades 18 and 20, as described later.
  • the waste removing means includes upper and lower rotating means comprising upper and lower rollers 34 and 36 and disposed on upper and lower sides of the feeding path of material 4.
  • the waste removing means further includes drive means by which at least one of the upper and lower rollers 34 and 36 is moved toward the waste 8.
  • the drive means comprises a linkage 38 by which the upper roller 34 is connected to the heat seal means 16, as in the case of the Thomson blades 18 and 20 and the linkage 26.
  • the upper roller 34 is therefore moved and lowered by the linkage 38 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped.
  • the waste removing means includes drive means by which at least one of the upper and lower rollers 34 and 36 is rotated at a considerable speed.
  • the drive means comprises a drive motor 40 connected to the lower roller 36.
  • the lower roller 36 is rotated by the drive motor 40 counterclockwise in Fig. 1 and at all times.
  • the apparatus includes discharge means disposed at a third station predetermined downstream of and at a distance from the second station at which the upper and lower rollers 34 and 36 are disposed.
  • the material 4 reaches the third station when intermittently fed again after partially cut by the Thomson blades 18 and 20, as also described later.
  • the material 4 is pulled and torn by the discharge means from the downstream edge 12 of waste 8 to be discharged by the discharge means as a plastic bag 2, the waste 8 being pulled, torn and removed by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8, after the waste 8 reaches the second station and the material 4 reaches the third station, as also described later.
  • the discharge means includes upper and lower belts 42 and 44 between which the material 4 is directed and sandwiched.
  • the upper belt 42 is engaged with a pulley 46.
  • the discharge means further includes a linkage 48 by which the pulley 46 is connected to the heat seal means 16. The pulley 46 is therefore moved and lowered by the linkage 48 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped.
  • the discharge means further includes drive means by which the upper and lower belts 42 and 44 are driven at a considerable speed.
  • the drive means comprises a drive motor 50 connected to pulleys 52 and 54, the upper and lower belts 42 and 44 being engaged with the pulleys 52 and 54.
  • a stop 56 is disposed between the second and third station and on the lower side of the feeding path of material 4.
  • the stop 56 is connected by a linkage 58 to the heat seal means 16 to be moved synchronously with the heat seal means 16 whenever the material 4 is intermittently fed.
  • the distance corresponds to the length for which the material 4 is intermittently fed.
  • the distance between the second station and the third station at which the upper and lower belts 42 and 44 are disposed it also corresponds to the length for which the material 4 is intermittently fed. Accordingly, the waste 8 reaches the second position to be directed between the upper and lower rollers 34 and 36 when the material 4 is intermittently fed again after partially cut by the Thomson blades 18 and 20. The material 4 reaches the third station to be directed between the upper and lower belts 42 and 44 when intermittently fed again after partially cut by the Thomson blades 18 and 20.
  • the material 4 is temporarily stopped when the waste 8 reaches the second station and the material 4 reaches the third station.
  • the pulley 46 is then moved and lowered by the linkage 48 synchronously with the heat seal means 16 so that the material 4 can be first sandwiched between the upper and lower belts 42 and 44.
  • the material 4 is therefore pulled by the upper and lower belts 42 and 44 driven by the drive motor 50.
  • the material 4 was partially cut by the Thomson blades 18 and 20 to be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 cf waste 8 before reaching the second and third stations, as described above.
  • the material 4 is first pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8 after the waste 8 reaches the second station and the material 4 reaches the third station.
  • the material 4 is therefore discharged by the upper and lower belts 42 and 44 as a plastic bag 2.
  • the upper roller 34 is then moved and lowered by the linkage 38 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36.
  • the lower roller 36 is rotated by the motor 40 counterclockwise in Fig. 1, as described above, so that the upper roller 34 can be rotated by the lower roller 36 clockwise in Fig. 1 when the waste 8 is sandwiched between them.
  • the waste 8 is then pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8.
  • the stop 56 is moved by the linkage 58 into the feeding path of material 4 at the same time as the upper roller 34 is moved by the linkage 38. The waste 8 is therefore torn and removed by the upper and lower rollers 34 and 36 to strike against the stop 56 for dropping along the stop 56.
  • the material 4 is partially cut and intermittently fed again and again, to successively make plastic bags 2 with wastes 8.
  • the material 4 is pulled and torn again and again to be discharged as a plastic bag 2.
  • the waste 8 is pulled, torn and removed again and again.
  • the material 4 is pulled and torn again and again to be discharged as plastic bags 2.
  • the wastes 8 are pulled, torn and removed again and again.
  • the wastes 8 can be removed automatically and reliably. Unlike the prior art, the plastic bags 2 and the wastes 8 can not adhere to each other by reason of certain factor such as static electricity, to be fed as they are.
  • the upper roller 34 may be positioned slightly downstream of the lower roller 36 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 and then torn and removed downstream of and obliquely downward from the upper and lower rollers 34 and 36.
  • the waste 8 can strike against the stop 56 which is not moved into the feeding path of material 4. The stop 56 is therefore not always required to be moved.
  • the material 4 is intermittently fed for a length which corresponds to the sum of sizes of plastic bag 2 and waste 8.
  • the apparatus may include drive means comprising ball screws by which the upper and lower rollers 34 and 36 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the the size of plastic bag 2 and waste 8.
  • the apparatus is therefore suitable to change the size of plastic bag 2 and waste 8 without difficulty.
  • the upper and lower rollers 34 and 36 may be moved by drive means other than the ball screws.
  • the upper roller 34 may be rotated at all times.
  • the lower roller 34 may be moved by a linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36.
  • the upper and lower rollers 34 and 36 may be rotated at all times respectively.
  • the upper and lower rollers 34 and 36 may be moved by linkages respectively.
  • One of the upper and lower rollers 34 and 36 may be rotated not at all times but temporarily.
  • the other roller is moved by the linkage while one of the upper and lower rollers is rotated so that the waste 8 can be sandwiched between and pulled and torn by the upper and lower rollers 34 and 36.
  • the material 4 may be half cut by the Thomson blades to a depth to be partially cut, along the upstream and downstream edges 10 and 12 of waste 8 so that the material 4 can be pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8, the waste 8 being pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8.
  • the material 4 may also be half cut by the Thomson blades to a depth to be partially cut so that it can be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 of waste 8.
  • the material 4 may be partially cut by partially cutting means other than the Thomson blades.
  • the apparatus is arranged to successively make plastic bags 2 with wastes 8, as shown in Fig. 4.
  • the material 4 may be partially or totally cut by the Thomson blades along cutting lines 59.
  • the material 4 may be partially cut by the Thomson blades along the upstream and downstream edges of the waste 8 and pulled and torn by the upper and lower belts 42 and 44 from the downstream edge of waste 8 to be discharged by the upper and lower belts 42 and 44 as a plastic bag 2.
  • the waste 8 should be then pulled, torn and removed by the upper and lower rollers 34 and 36 from the upstream edge of waste 8.
  • each of the upper and lower rollers 34, 36 may have locally large portions so that the waste 8 can be sandwiched between and pulled, torn and removed by the locally large portions, as shown in Fig. 5.
  • the waste removing means may include rotating members other than the upper and lower rollers 34 and 36.
  • the waste removing means may include rotating members comprising upper and lower arms 60 and 62, as shown in Fig. 6.
  • the upper arm 60 is rotated by drive means clockwise about a pin 64 while the lower arm 62 is rotated by drive means counterclockwise about a pin 66 so that the waste 8 can be sandwiched between and pulled, torn and removed downstream of the upper and lower arms 60 and 62.
  • the waste 8 is held by the waste removing means after reaching the second station so that the material 4 can be pulled and torn by the discharge means from the downstream edge 12 of waste 8.
  • the waste 8 is then pulled and torn by the waste removing means from the upstream edge 10 of waste 8.
  • the waste removing means includes upper and lower rotating member comprising upper and lower rollers 34 and 36 and disposed on the upper and lower sides of the feeding path of material 4.
  • the discharge means comprises upper and lower belts 42 and 44, as in the case of the apparatus of Fig. 1.
  • the waste removing means further includes drive means by which at least one of the upper and lower rollers 34 and 36 is moved toward the waste 8 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 after reaching the second station.
  • the drive means comprises a lever 68 and a linkage by which the upper roller 34 is connected to the heat seal means. The upper roller 34 is therefore moved by the lever 68 and the linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36.
  • the upper and lower rollers 34 and 36 are first kept from being rotated so that the waste 8 can be held by the upper and lower rollers 34 and 36.
  • the material 4 can therefore be pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8 to be discharged. Accordingly, unlike the apparatus of Fig 1, the material 4 has therefore not to be partially cut by the partially cutting means to be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 of waste 8.
  • the waste removing means includes drive means by which at least one of the upper and lower rollers 34 and 36 is rotated at a considerable speed so that the waste 8 can be pulled and torn by the upper and lower rollers 34 and 36.
  • the drive means comprises a control 70 connected to a drive motor 72 such as a servo motor which is connected to the lower roller 36.
  • the lower roller 36 is rotated by the control 70 and the drive motor 72 counterclockwise in Fig. 7 after the material 4 is torn and discharged.
  • the upper roller 34 is therefore rotated by the lower roller 36 clockwise in Fig. 7 so that the waste 8 can be pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8 to be removed.
  • the drive motor 72 can be controlled by the control 70 to change the speed of the upper and lower rollers 34 and 36.
  • the upper and lower rollers 34 and 36 are rotated at a high speed when the waste 8 is pulled and torn.
  • the upper and lower rollers 34 and 36 are then decelerated into a low speed before the waste 8 is released from the upper and lower rollers 34 and 36.
  • the waste 8 is therefore released and removed slowly.
  • the apparatus may include ball screws by which the upper and lower rollers 34 and 36 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the size of plastic bag 2 and waste 8.
  • the lower roller 36 may be moved by a linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36.
  • the drive motor 72 may be connected not to the lower roller 36 but to the upper roller 34 so that the upper and lower rollers 34 and 36 can be rotated by the drive motor 72.
  • the upper and lower rollers 34 and 36 may be moved by linkages respectively.
  • the drive motor 72 may be connected to the upper and lower rollers 34 and 36.
  • the waste 8 can be pulled, torn and removed by the upper and lower rollers 34 and 36 of Fig. 7.
  • the upper and lower rollers 34 and 36 may have locally large portions, as in the case of those of Fig. 5.
  • the waste removing means may comprise rotating members other than the upper and lower rollers 34 and 36.
  • the waste removing means includes upper and lower fingers 74 and 76 disposed on upper and lower sides of the feeding path of material 4.
  • the waste removing means further includes drive means by which at least one of the upper and lower fingers 74 and 76 is moved toward the waste 8.
  • the drive means comprises air cylinders 78 mounted on carriages 80 and connected to the upper and lower fingers 74 and 76. The upper and lower fingers 74 and 76 are moved by the air cylinders 78 so that the waste 8 can be sandwiched between and held by the upper and lower fingers 74 and 76 after reaching the second station at which the upper and lower fingers 74 and 76 are disposed.
  • the waste removing means include drive means by which the upper and lower fingers 74 and 76 are moved in a direction in which the material 4 is intermittently fed.
  • the drive means comprises air cylinders 82 connected to the carriages 80. The upper and lower fingers 74 and 76 and the carriages 80 are moved by the air cylinders 82 so that the waste 8 can be pulled and torn by the upper and lower fingers 74 and 76.
  • the apparatus may include ball screws by which the upper and lower fingers 74 and 76 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the size of plastic bag 2 and waste 8.
  • a plurality of upper and lower fingers 74 and 76 may be spaced from each other widthwise of the material 4.
  • the upper and lower fingers 74 and 76 may be movable widthwise of the material 4 to change the spaces of upper and lower fingers 74 and 76.
  • the waste 8 can be pulled, torn and removed by the upper and lower fingers 74 and 76.
  • the discharge means includes the upper and lower belts 42 and 44 shown in Fig. 1.
  • the upper and lower belts 42 and 44 are driven at a first speed.
  • the waste removing means includes upper and lower rotating members comprising the upper and lower rollers 34 and 36 in Fig. 1, Fig. 4 or Fig. 5. At least one of the upper and lower rollers 34 and 36 is moved toward the waste 8 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 at the same time as the material 4 is sandwiched between the upper and lower belts 42 and 44. In addition, at least one of the upper and lower rollers 34 and 36 is rotated at a second speed lower than the first speed.
  • the material 4 is pulled and torn by the upper and lower belts 42 and 44, while the waste 8 is pulled and torn by the upper and lower rollers 34 and 36, by means of a difference in speed between the upper and lower belts 42 and 44 and the upper and lower rollers 34 and 36.
  • the apparatus includes partially cutting means combined with totally cutting means.
  • the material 4 is partially cut by the partially cutting means along the upstream edge 10 and totally cut by the totally cutting means along the downstream edge 12 of waste 8 whenever intermittently fed and temporarily stopped.
  • the partially cutting means includes Thomson blade means comprising a Thomson blade 84, mounted on a carriage 22 and opposed to the material 4.
  • the partially cutting means further includes drive means such as the linkage 26, as in the case of the Thomson blades 18 and 20 of Fig. 1.
  • the Thomson blade 84 has the same micro depressions as the Thomson blade 18 or 20. Accordingly, the Thomson blade 84 is moved toward the material 4 so that the material 4 can be partially cut by the Thomson blade 84 along the upstream edge 10 of waste 8.
  • the micro joints make the material 4 partially cut.
  • the waste 8 is therefore kept connected with the material 4 by the micro joints.
  • the totally cutting means comprises Thomson blade 86 mounted on the carriage 22 and opposed to the material 4.
  • the Thomson blade 86 has no depression. Accordingly, the Thomson blade 86 is moved toward the material 4 so that the material 4 can be totally cut by the Thomson blade 86 along the downstream edge 12 of waste 8.
  • the apparatus further includes discharge means disposed downstream of and at a distance from the Thomson blades 84 and 86.
  • the discharge means comprises upper and lower belts 42 and 44 between which the material 4 is directed.
  • the upper belt 42 is engaged with the pulley 46 which is moved by the linkage 48, as in the case of the apparatus of Fig. 1, so that the material 4 can be sandwiched between the upper and lower belts 42 and 44 when partially and totally cut by the Thomson blades 84 and 86.
  • the material 4 is therefore discharged by the upper and lower belts 42 and 44 as a plastic bag 2 after partially and totally cut by the Thomson blades 84 and 86.
  • the pulley 46 is then moved by the linkage 48 to return to the original position.
  • the waste 8 then reaches the upper and lower belts 42 and 44 when the material 4 is intermittently fed again.
  • the waste 8 is directed and sandwiched between the upper and lower belts 42 and 44 at the position of pulleys 52 and 54. The waste 8 is therefore pulled, torn and removed by the upper and lower belts 42 and 44 from the upstream edge 10 of waste 8.
  • the apparatus further includes stop means incorporated into the upper and lower belts 42 and 44.
  • the upper belt 42 comprises a plurality of narrow belts extending parallel to the feeding path of material 4 and spaced from each other perpendicularly to the feeding path of material 4, as shown in Fig. 10.
  • the stop means comprises a stop 88 which is comb-shaped and inserted between the narrow belts 42.
  • the lower belt 44 comprises upstream and downstream belts spaced from each other along the feeding path of material 4.
  • the stop 88 is moved by an air cylinder 90 to advance into the feeding path of material 4 between the upstream and downstream belts 44 when the waste 8 is pulled and torn by the upper and lower belts 42 and 44 so that the waste 8 can strike against the stop 88 to pass between the upstream and downstream belts 44 for dropping from the upper and lower belts 42 and 44.
  • the stop 88 is then moved by the air cylinder 90 to return the original position.
  • the material 4 is partially and totally cut again and again, to be discharged as a plastic bag 2.
  • the waste 8 is then pulled, torn and removed again and again.
  • the apparatus may include detector means for detecting rejected bags.
  • the stop 88 may be moved in response to the detecting signal from the detector means so that rejected bags can be removed by the stop 88.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Moulding By Coating Moulds (AREA)

Abstract

In an apparatus for making plastic bags (2) from a web material (4) comprising two or more layers of plastic film, the material (4) is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags (2) with wastes (8), each of the wastes having upstream (10) and downstream (12) edges. The apparatus includes partially cutting means (18,20) disposed at a first station (18,20,22,24) predetermined along the feeding path. The material (4) is partially cut by the partially cutting means (18,20) along the upstream (10) and downstream (12) edges of waste whenever intermittently fed and temporarily stopped. The apparatus further includes waste removing means (34,36) disposed at a second station (34,36,38,40) predetermined downstream of and at a distance from the first station (18,20,22,24). The waste (8) reaches the second station when the material (4) is intermittently fed again after partially cut by the partially cutting means (18,20). In addition, the apparatus includes discharge means (42,44) disposed at a third station (42,44,46,48) predetermined downstream of and at a distance from the second station (34,36,38,40). <IMAGE>

Description

FIELD OF THE INVENTION
The invention relates to an apparatus according to the preambles of claims 1 and 13 for making plastic bags. An example of such a device is shown in JP9295625A.
PRIOR ART
There has been commercially available an apparatus for making plastic bags 2 from a web material 4 comprising two or more layers of plastic film, as shown in Fig. 11. The apparatus includes feeding means by which the material 4 is intermittently fed for a length along a longitudinal feeding path. The material 4 is heat sealed by heat seal means longitudinally and widthwise of the material 4 whenever intermittently fed and temporarily stopped so that heat sealed portions 5 can be formed longitudinally and widthwise of the material 4. In two rows production, the material 4 may be slitted by slitting means along a slit line 6. In case of shaped bags 2 each of which has opposite sides curved convexly or concavely, the apparatus is arranged to successively make plastic bags 2 with wastes 8. Each of the wastes 8 has upstream and downstream edges 10 and 12. In general, the material 4 is totally cut by suitable cutting means along the upstream and downstream edges 10 and 12 of waste 8 whenever intermittently fed and temporarily stopped. The wastes 8 are therefore brought into existence one by one or two by two by making shaped bags 2. The waste 8 may be called a waste material or scrap.
Under the circumstances, a hole is usually formed under the feeding path of material so that the wastes can be dropped down through the hole to be removed. However, the wastes 8 can neither always be dropped down nor removed even if the material 4 is totally cut. The plastic bags 2 and the wastes 8 may adhere to each other by reason of certain factor such as static electricity, to be fed as they are. The wastes 8 must therefore be removed later and manually by operator from the plastic bags 2, taking labours and times. In addition, as to the hole through which the wastes 8 are dropped down, it is required to change the size of hole when changing the size of plastic bag 2 and waste 8.
JP 2000 190403 A, which was published an July 11, 2000, discloses an apparatus for making plastic bags from a web material comprising two or more layers of plastic film, said apparatus including feeding means by which said material is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags with wastes, each of said wastes having upstream and downstream edges. At first, these are formed micro connections between those parts of the web material which forms the plastic bags and the wastes, and thereafter the wastes are torn off.
It is therefore an object of the invention to provide a new and improved apparatus for making plastic bags from a web material comprising two or more layers of plastic film, to overcome the above problems. The apparatus including feeding means by which the material is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags with wastes, each of the wastes having upstream and downstream edges.
Another object of the invention is to provide the apparatus in which the wastes can be removed automatically and reliably, without adhering to the plastic bags.
SUMMARY OF THE INVENTION
According to the invention, these objects are achieved by an apparatus having the features of claim 1.
In a preferred embodiment, the partially cutting means comprises Thomson blade means opposed to the material. The partially cutting means may further comprise drive means by which the Thomson blade means is moved toward the material so that the material can be partially cut by the Thomson blade means along the upstream and downstream edges of waste.
The Thomson blade means has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints formed and spaced from each other along the upstream and downstream edges of waste. The micro joints make the material partially cut. The material and the waste are kept connected with each other by the micro joints.
Preferably the material is partially cut by the partially cutting means to be pulled and torn more easily at the downstream edge than at the upstream edge of waste. The material is first pulled and torn by the discharge means from the downstream edge of waste after the waste reaches the second station and the material reaches the third station. The waste is then pulled and torn by the waste removing means from the upstream edge of waste.
Preferably the waste removing means comprises upper and lower rotating members disposed on upper and lower sides of the feeding path. The waste removing means further comprises drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between the upper and lower rotating members. In addition, the waste removing means may comprise drive means by which at least one of the upper and lower rotating members is rotated at a considerable speed so that the waste can be pulled and torn by the upper and lower rotating members.
The discharge means advantageously comprises upper and lower belts between which the material is directed and sandwiched to be pulled and torn by the upper and lower belts.
In other embodiment, the waste may be held by the waste removing means after reaching the second station so that the material can be pulled and torn by the discharge means from the downstream edge of waste. The waste is then pulled and torn by the waste removing means from the upstream edge of waste.
The waste removing means may comprise drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between and held by the upper and lower rotating members after reaching the second station.
In other embodiment, the waste removing means may comprise upper and lower fingers disposed on upper and lower sides of the feeding path. The waste removing means may further comprise drive means by which at least one of the upper and lower fingers is moved toward the waste so that the waste can be sandwiched between and held by the upper and lower fingers after reaching the second station. In addition, the waste removing means preferably comprises drive means by which the upper and lower fingers are moved in a direction so that the waste can be pulled and torn by the upper and lower fingers.
In other optional embodiment, the discharge means comprises drive means by which the upper and lower belts are driven at a first speed. The waste removing means comprises drive means by which at least one of the upper and lower rotating members is moved toward the waste so that the waste can be sandwiched between the upper and lower rotating members at the same time as the material is sandwiched between the upper and lower belts. The waste removing means further comprises drive means by which at least one of the upper and lower rotating members is rotated at a second speed lower than the first speed so that the material is pulled and torn by the upper and lower belts, while the waste is pulled and torn by the upper and lower rotating members, by means of a difference in speed between the upper and lower belts and the upper and lower rotating members.
According to the invention, these objects are also achieved by an apparatus having the features of claim 13.
The partially cutting means of claim 13 preferably comprises drive means by which the Thomson blade means is moved toward the material so that the material can be partially cut by the Thomson blade means along the upstream edge of waste. The optional micro joints of claim 15 make the material partially cut. The waste is kept connected with the material by the micro joints.
The optional discharge means of claim 16 comprises upper and lower belts, the material being directed and sandwiched between the upper and lower belts to be discharged by the upper and lower belts. The waste is then directed and sandwiched between the upper and lower belts to be pulled, torn and removed by the upper and lower belts. Stop means is incorporated into the upper and lower belts so that the waste can strike against the stop means for dropping from the upper and lower belts.
BRIEF DESCRIPTION OF THE DRAWINGS
  • Fig. 1 is a side view of a preferred embodiment of the invention.
  • Fig. 2 is an enlarged view of the Thomson blades of Fig. 1.
  • Fig. 3 is a plan view of the apparatus of Fig. 1.
  • Fig. 4 is a plan view of other embodiment.
  • Fig. 5 is a plan view of other embodiment.
  • Fig. 6 is a side view of other embodiment.
  • Fig. 7 is a side view of other embodiment.
  • Fig. 8 is a side view of other embodiment.
  • Fig. 9 is a side view of other embodiment.
  • Fig. 10 is a plan view of the apparatus of Fig. 9.
  • Fig. 11 is a plan view showing plastic bags and wastes in prior art.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
    Referring now to the drawings, Fig. 1 illustrates an apparatus for making plastic bags 2 from a web material 4 comprising two or more layers of plastic film, according to the invention. Each of the plastic bags 2 comprises a shaped bag having opposite sides curved convexly or concavely, as in the case of the apparatus of Fig. 11. The apparatus includes feeding means by which the material 4 is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags 2 with wastes 8. Each of the wastes 8 has upstream and downstream edges 10 and 12.
    In the embodiment, the feeding means comprises upper and lower rollers 14 between which the material 4 is directed and sandwiched. The upper and lower rollers 14 are rotated by drive means such as a servo motor so that the material 4 can be intermittently fed for a length. In addition, the material 4 is heat sealed by heat seal means 16 longitudinally and widthwise of the material 4 whenever intermittently fed and temporarily stopped so that heat sealed portions 5 can be formed longitudinally and widthwise of the material 4. The material 4 is slitted by slitting means along a slit line 6, as in the case of the apparatus of Fig. 11.
    The apparatus further includes partially cutting means disposed at a first station predetermined along the feeding path of material 4. The material 4 is partially cut by the partially cutting means along the upstream and downstream edges 10 and 12 of waste 8 whenever intermittently fed and temporarily stopped.
    The partially cutting means includes Thomson blade means comprising a pair of Thomson blades 18 and 20 and opposed to the material 4. The Thomson blades 18 and 20 are spaced from each other along the feeding path of material 4 and mounted on a carriage 22, the material 4 being directed between the Thomson blades 18 and 20 and a receiver 24. The partially cutting means further includes drive means by which the Thomson blades 18 and 20 are moved toward the material 4 whenever the material 4 is intermittently fed and temporarily stopped. For example, the drive means comprises a linkage 26 by which the carriage 22 is connected to the heat seal means 16. The Thomson blades 18 and 20 and the carriage 22 are therefore moved and lowered by the linkage 26 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped so that the material 4 can be sandwiched between the Thomson blades 18 and 20 and the receiver 24 to be partially cut by the Thomson blades 18 and 20 along the upstream and downstream edges 10 and 12 of waste 8.
    In this connection, it should be noted that the material 4 is not totally cut but partially cut by the Thomson blades 18 and 20. The material 4 and the waste 8 are therefore not completely separated from each other. In the embodiment, each of the Thomson blades 18 and 20 has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints 28 and 30 formed and spaced from each other along the upstream and downstream edges 10 and 12 of waste 8, as shown in Fig. 3. The micro joints 28 and 30 make the material 4 partially cut. The material 4 and the waste 8 are kept connected with each other by the micro joints 28 and 30. In addition, the micro joints 30 are less in number than the micro joints 28. It should therefore be understood that the material 4 is partially cut by the Thomson blades 18 and 20 to be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 of waste 8. The micro joints 28 and 30 are shown in exaggeration for convenience. In point of fact, each of the micro joints 28 and 30 has a very small size of about 0.1 mm.
    Furthermore, urethan rubbers 32 are disposed on the opposite sides of each of the Thomson blades 18 and 20 and mounted on the carriage 22, as shown in Fig. 2. The urethan rubbers 32 are pressed against the material 4 and the receiver 24 to be elastically deformed so that the material 4 can be held by the urethan rubbers 32 when partially cut by the Thomson blades 18 and 20. The carriage 22 and the Thomson blades 18 and 20 are then moved and lifted by the linkage 26 synchronously with the seal means 16 to be retracted from the material 4 and the receiver 24. The urethan rubbers 32 are elastically restored to the original state so that the material 4 can be pushed by the urethan rubbers 32 to be separated from the Thomson blades 18 and 20. This prevents the material 4 from adhering to the Thomson blades 18 and 20. The material 4 is therefore not pulled upwardly by the Thomson blades 18 and 20.
    The apparatus further includes waste removing means disposed at a second station predetermined downstream of and at a distance from the first station at which the Thomson blades 18 and 20 are disposed. The waste 8 reaches the second station when the material 4 is intermittently fed again after partially cut by the Thomson blades 18 and 20, as described later.
    In the embodiment, the waste removing means includes upper and lower rotating means comprising upper and lower rollers 34 and 36 and disposed on upper and lower sides of the feeding path of material 4. The waste removing means further includes drive means by which at least one of the upper and lower rollers 34 and 36 is moved toward the waste 8. The drive means comprises a linkage 38 by which the upper roller 34 is connected to the heat seal means 16, as in the case of the Thomson blades 18 and 20 and the linkage 26. The upper roller 34 is therefore moved and lowered by the linkage 38 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped. In addition, the waste removing means includes drive means by which at least one of the upper and lower rollers 34 and 36 is rotated at a considerable speed. The drive means comprises a drive motor 40 connected to the lower roller 36. The lower roller 36 is rotated by the drive motor 40 counterclockwise in Fig. 1 and at all times.
    In addition, the apparatus includes discharge means disposed at a third station predetermined downstream of and at a distance from the second station at which the upper and lower rollers 34 and 36 are disposed. The material 4 reaches the third station when intermittently fed again after partially cut by the Thomson blades 18 and 20, as also described later. The material 4 is pulled and torn by the discharge means from the downstream edge 12 of waste 8 to be discharged by the discharge means as a plastic bag 2, the waste 8 being pulled, torn and removed by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8, after the waste 8 reaches the second station and the material 4 reaches the third station, as also described later.
    In the embodiment, the discharge means includes upper and lower belts 42 and 44 between which the material 4 is directed and sandwiched. The upper belt 42 is engaged with a pulley 46. The discharge means further includes a linkage 48 by which the pulley 46 is connected to the heat seal means 16. The pulley 46 is therefore moved and lowered by the linkage 48 synchronously with the heat seal means 16 whenever the material 4 is intermittently fed and temporarily stopped. In addition, the discharge means further includes drive means by which the upper and lower belts 42 and 44 are driven at a considerable speed. The drive means comprises a drive motor 50 connected to pulleys 52 and 54, the upper and lower belts 42 and 44 being engaged with the pulleys 52 and 54.
    Furthermore, a stop 56 is disposed between the second and third station and on the lower side of the feeding path of material 4. The stop 56 is connected by a linkage 58 to the heat seal means 16 to be moved synchronously with the heat seal means 16 whenever the material 4 is intermittently fed.
    In the apparatus, as to the distance between the first station at which the Thomson blades 18 and 20 are disposed and the second station at which the upper and lower rollers 34 and 36 are disposed, the distance corresponds to the length for which the material 4 is intermittently fed. As to the distance between the second station and the third station at which the upper and lower belts 42 and 44 are disposed, it also corresponds to the length for which the material 4 is intermittently fed. Accordingly, the waste 8 reaches the second position to be directed between the upper and lower rollers 34 and 36 when the material 4 is intermittently fed again after partially cut by the Thomson blades 18 and 20. The material 4 reaches the third station to be directed between the upper and lower belts 42 and 44 when intermittently fed again after partially cut by the Thomson blades 18 and 20.
    Furthermore, in the apparatus, the material 4 is temporarily stopped when the waste 8 reaches the second station and the material 4 reaches the third station. The pulley 46 is then moved and lowered by the linkage 48 synchronously with the heat seal means 16 so that the material 4 can be first sandwiched between the upper and lower belts 42 and 44. The material 4 is therefore pulled by the upper and lower belts 42 and 44 driven by the drive motor 50. In addition, the material 4 was partially cut by the Thomson blades 18 and 20 to be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 cf waste 8 before reaching the second and third stations, as described above. Accordingly, the material 4 is first pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8 after the waste 8 reaches the second station and the material 4 reaches the third station. The material 4 is therefore discharged by the upper and lower belts 42 and 44 as a plastic bag 2.
    The upper roller 34 is then moved and lowered by the linkage 38 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36. The lower roller 36 is rotated by the motor 40 counterclockwise in Fig. 1, as described above, so that the upper roller 34 can be rotated by the lower roller 36 clockwise in Fig. 1 when the waste 8 is sandwiched between them. Accordingly, the waste 8 is then pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8. In addition, the stop 56 is moved by the linkage 58 into the feeding path of material 4 at the same time as the upper roller 34 is moved by the linkage 38. The waste 8 is therefore torn and removed by the upper and lower rollers 34 and 36 to strike against the stop 56 for dropping along the stop 56.
    The material 4 is partially cut and intermittently fed again and again, to successively make plastic bags 2 with wastes 8. The material 4 is pulled and torn again and again to be discharged as a plastic bag 2. The waste 8 is pulled, torn and removed again and again. To be exact, in the two rows production in which the material 4 is slitted by slitting means along the slit line 6, the material 4 is pulled and torn again and again to be discharged as plastic bags 2. The wastes 8 are pulled, torn and removed again and again.
    Accordingly, in the apparatus, the wastes 8 can be removed automatically and reliably. Unlike the prior art, the plastic bags 2 and the wastes 8 can not adhere to each other by reason of certain factor such as static electricity, to be fed as they are.
    As to the upper and lower rollers 34 and 36, the upper roller 34 may be positioned slightly downstream of the lower roller 36 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 and then torn and removed downstream of and obliquely downward from the upper and lower rollers 34 and 36. In the case, the waste 8 can strike against the stop 56 which is not moved into the feeding path of material 4. The stop 56 is therefore not always required to be moved.
    By the way, it should be noted that the material 4 is intermittently fed for a length which corresponds to the sum of sizes of plastic bag 2 and waste 8. As to the distance between the first station at which the Thomson blades 18 and 20 are disposed and the second station at which the upper and lower rollers 34 and 36 are disposed, it must correspond to the length for which the material 4 is intermittently fed, as described above. In this connection, the apparatus may include drive means comprising ball screws by which the upper and lower rollers 34 and 36 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the the size of plastic bag 2 and waste 8. The apparatus is therefore suitable to change the size of plastic bag 2 and waste 8 without difficulty. The upper and lower rollers 34 and 36 may be moved by drive means other than the ball screws.
    As to the upper and lower rollers 34 and 36, instead of the lower roller 36 rotated at all the times, the upper roller 34 may be rotated at all times. Instead of the upper roller 34 moved by the linkage 38, the lower roller 34 may be moved by a linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36. The upper and lower rollers 34 and 36 may be rotated at all times respectively. The upper and lower rollers 34 and 36 may be moved by linkages respectively.
    One of the upper and lower rollers 34 and 36 may be rotated not at all times but temporarily. The other roller is moved by the linkage while one of the upper and lower rollers is rotated so that the waste 8 can be sandwiched between and pulled and torn by the upper and lower rollers 34 and 36.
    It is not always necessary to leave the micro joints 28 and 30 formed and spaced from each other along the upstream and downstream edges 10 and 12 of waste 8. The material 4 may be half cut by the Thomson blades to a depth to be partially cut, along the upstream and downstream edges 10 and 12 of waste 8 so that the material 4 can be pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8, the waste 8 being pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8. The material 4 may also be half cut by the Thomson blades to a depth to be partially cut so that it can be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 of waste 8. The material 4 may be partially cut by partially cutting means other than the Thomson blades.
    As to the plastic bag 2 to be corner cut, the apparatus is arranged to successively make plastic bags 2 with wastes 8, as shown in Fig. 4. In the case, the material 4 may be partially or totally cut by the Thomson blades along cutting lines 59. In addition, the material 4 may be partially cut by the Thomson blades along the upstream and downstream edges of the waste 8 and pulled and torn by the upper and lower belts 42 and 44 from the downstream edge of waste 8 to be discharged by the upper and lower belts 42 and 44 as a plastic bag 2. The waste 8 should be then pulled, torn and removed by the upper and lower rollers 34 and 36 from the upstream edge of waste 8.
    In stead of each of the upper and lower rollers 34, 36 having a diameter, it may have locally large portions so that the waste 8 can be sandwiched between and pulled, torn and removed by the locally large portions, as shown in Fig. 5.
    The waste removing means may include rotating members other than the upper and lower rollers 34 and 36. For example, the waste removing means may include rotating members comprising upper and lower arms 60 and 62, as shown in Fig. 6. The upper arm 60 is rotated by drive means clockwise about a pin 64 while the lower arm 62 is rotated by drive means counterclockwise about a pin 66 so that the waste 8 can be sandwiched between and pulled, torn and removed downstream of the upper and lower arms 60 and 62.
    In other embodiment shown in Fig. 7, the waste 8 is held by the waste removing means after reaching the second station so that the material 4 can be pulled and torn by the discharge means from the downstream edge 12 of waste 8. The waste 8 is then pulled and torn by the waste removing means from the upstream edge 10 of waste 8. The waste removing means includes upper and lower rotating member comprising upper and lower rollers 34 and 36 and disposed on the upper and lower sides of the feeding path of material 4. The discharge means comprises upper and lower belts 42 and 44, as in the case of the apparatus of Fig. 1.
    In the embodiment of Fig. 7, the waste removing means further includes drive means by which at least one of the upper and lower rollers 34 and 36 is moved toward the waste 8 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 after reaching the second station. The drive means comprises a lever 68 and a linkage by which the upper roller 34 is connected to the heat seal means. The upper roller 34 is therefore moved by the lever 68 and the linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36.
    The upper and lower rollers 34 and 36 are first kept from being rotated so that the waste 8 can be held by the upper and lower rollers 34 and 36. The material 4 can therefore be pulled and torn by the upper and lower belts 42 and 44 from the downstream edge 12 of waste 8 to be discharged. Accordingly, unlike the apparatus of Fig 1, the material 4 has therefore not to be partially cut by the partially cutting means to be pulled and torn more easily at the downstream edge 12 than at the upstream edge 10 of waste 8.
    In addition, the waste removing means includes drive means by which at least one of the upper and lower rollers 34 and 36 is rotated at a considerable speed so that the waste 8 can be pulled and torn by the upper and lower rollers 34 and 36. The drive means comprises a control 70 connected to a drive motor 72 such as a servo motor which is connected to the lower roller 36. The lower roller 36 is rotated by the control 70 and the drive motor 72 counterclockwise in Fig. 7 after the material 4 is torn and discharged. The upper roller 34 is therefore rotated by the lower roller 36 clockwise in Fig. 7 so that the waste 8 can be pulled and torn by the upper and lower rollers 34 and 36 from the upstream edge 10 of waste 8 to be removed.
    The drive motor 72 can be controlled by the control 70 to change the speed of the upper and lower rollers 34 and 36. For example, the upper and lower rollers 34 and 36 are rotated at a high speed when the waste 8 is pulled and torn. The upper and lower rollers 34 and 36 are then decelerated into a low speed before the waste 8 is released from the upper and lower rollers 34 and 36. The waste 8 is therefore released and removed slowly.
    In the embodiment of Fig. 7, the apparatus may include ball screws by which the upper and lower rollers 34 and 36 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the size of plastic bag 2 and waste 8. The lower roller 36 may be moved by a linkage so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36. The drive motor 72 may be connected not to the lower roller 36 but to the upper roller 34 so that the upper and lower rollers 34 and 36 can be rotated by the drive motor 72. The upper and lower rollers 34 and 36 may be moved by linkages respectively. The drive motor 72 may be connected to the upper and lower rollers 34 and 36.
    As to the plastic bag 2 and the waste 8 of Fig. 4, the waste 8 can be pulled, torn and removed by the upper and lower rollers 34 and 36 of Fig. 7. The upper and lower rollers 34 and 36 may have locally large portions, as in the case of those of Fig. 5. The waste removing means may comprise rotating members other than the upper and lower rollers 34 and 36.
    In other embodiment shown in Fig. 8, the waste removing means includes upper and lower fingers 74 and 76 disposed on upper and lower sides of the feeding path of material 4. The waste removing means further includes drive means by which at least one of the upper and lower fingers 74 and 76 is moved toward the waste 8. The drive means comprises air cylinders 78 mounted on carriages 80 and connected to the upper and lower fingers 74 and 76. The upper and lower fingers 74 and 76 are moved by the air cylinders 78 so that the waste 8 can be sandwiched between and held by the upper and lower fingers 74 and 76 after reaching the second station at which the upper and lower fingers 74 and 76 are disposed.
    Accordingly, the material 4 can be pulled, torn and discharged by the upper and lower belts, as in the case of the apparatus of Fig. 7. In addition, the waste removing means include drive means by which the upper and lower fingers 74 and 76 are moved in a direction in which the material 4 is intermittently fed. The drive means comprises air cylinders 82 connected to the carriages 80. The upper and lower fingers 74 and 76 and the carriages 80 are moved by the air cylinders 82 so that the waste 8 can be pulled and torn by the upper and lower fingers 74 and 76.
    In the embodiment of Fig. 8, the apparatus may include ball screws by which the upper and lower fingers 74 and 76 are moved along the feeding path of material 4 to adjust the distance between the first and second stations when changing the size of plastic bag 2 and waste 8. A plurality of upper and lower fingers 74 and 76 may be spaced from each other widthwise of the material 4. The upper and lower fingers 74 and 76 may be movable widthwise of the material 4 to change the spaces of upper and lower fingers 74 and 76. In the case, as to the plastic bag 2 and the waste 8 of Fig. 4, the waste 8 can be pulled, torn and removed by the upper and lower fingers 74 and 76.
    In other embodiment, the discharge means includes the upper and lower belts 42 and 44 shown in Fig. 1. The upper and lower belts 42 and 44 are driven at a first speed. The waste removing means includes upper and lower rotating members comprising the upper and lower rollers 34 and 36 in Fig. 1, Fig. 4 or Fig. 5. At least one of the upper and lower rollers 34 and 36 is moved toward the waste 8 so that the waste 8 can be sandwiched between the upper and lower rollers 34 and 36 at the same time as the material 4 is sandwiched between the upper and lower belts 42 and 44. In addition, at least one of the upper and lower rollers 34 and 36 is rotated at a second speed lower than the first speed. Accordingly, the material 4 is pulled and torn by the upper and lower belts 42 and 44, while the waste 8 is pulled and torn by the upper and lower rollers 34 and 36, by means of a difference in speed between the upper and lower belts 42 and 44 and the upper and lower rollers 34 and 36.
    In other embodiment shown in Fig. 9, the apparatus includes partially cutting means combined with totally cutting means. The material 4 is partially cut by the partially cutting means along the upstream edge 10 and totally cut by the totally cutting means along the downstream edge 12 of waste 8 whenever intermittently fed and temporarily stopped.
    The partially cutting means includes Thomson blade means comprising a Thomson blade 84, mounted on a carriage 22 and opposed to the material 4. The partially cutting means further includes drive means such as the linkage 26, as in the case of the Thomson blades 18 and 20 of Fig. 1. The Thomson blade 84 has the same micro depressions as the Thomson blade 18 or 20. Accordingly, the Thomson blade 84 is moved toward the material 4 so that the material 4 can be partially cut by the Thomson blade 84 along the upstream edge 10 of waste 8. The micro joints make the material 4 partially cut. The waste 8 is therefore kept connected with the material 4 by the micro joints.
    The totally cutting means comprises Thomson blade 86 mounted on the carriage 22 and opposed to the material 4. The Thomson blade 86 has no depression. Accordingly, the Thomson blade 86 is moved toward the material 4 so that the material 4 can be totally cut by the Thomson blade 86 along the downstream edge 12 of waste 8.
    The apparatus further includes discharge means disposed downstream of and at a distance from the Thomson blades 84 and 86. The discharge means comprises upper and lower belts 42 and 44 between which the material 4 is directed. The upper belt 42 is engaged with the pulley 46 which is moved by the linkage 48, as in the case of the apparatus of Fig. 1, so that the material 4 can be sandwiched between the upper and lower belts 42 and 44 when partially and totally cut by the Thomson blades 84 and 86. The material 4 is therefore discharged by the upper and lower belts 42 and 44 as a plastic bag 2 after partially and totally cut by the Thomson blades 84 and 86. The pulley 46 is then moved by the linkage 48 to return to the original position.
    The waste 8 then reaches the upper and lower belts 42 and 44 when the material 4 is intermittently fed again. In the embodiment, the waste 8 is directed and sandwiched between the upper and lower belts 42 and 44 at the position of pulleys 52 and 54. The waste 8 is therefore pulled, torn and removed by the upper and lower belts 42 and 44 from the upstream edge 10 of waste 8.
    The apparatus further includes stop means incorporated into the upper and lower belts 42 and 44. In the embodiment, the upper belt 42 comprises a plurality of narrow belts extending parallel to the feeding path of material 4 and spaced from each other perpendicularly to the feeding path of material 4, as shown in Fig. 10. The stop means comprises a stop 88 which is comb-shaped and inserted between the narrow belts 42. The lower belt 44 comprises upstream and downstream belts spaced from each other along the feeding path of material 4. The stop 88 is moved by an air cylinder 90 to advance into the feeding path of material 4 between the upstream and downstream belts 44 when the waste 8 is pulled and torn by the upper and lower belts 42 and 44 so that the waste 8 can strike against the stop 88 to pass between the upstream and downstream belts 44 for dropping from the upper and lower belts 42 and 44. The stop 88 is then moved by the air cylinder 90 to return the original position.
    The material 4 is partially and totally cut again and again, to be discharged as a plastic bag 2. The waste 8 is then pulled, torn and removed again and again.
    The apparatus may include detector means for detecting rejected bags. In the case, the stop 88 may be moved in response to the detecting signal from the detector means so that rejected bags can be removed by the stop 88.

    Claims (16)

    1. An apparatus for making plastic bags (2) from a web material (4) comprising two or more layers of plastic film, said apparatus including feeding means (14) by which said material (4) is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags (2) with wastes (8), each of said wastes (8) having upstream and downstream edges (10, 12), said apparatus characterized by
         partially cutting means (18, 20) disposed at a first station predetermined along said feeding path, said material (4) being partially cut by said partially cutting means (18, 20) along said upstream and downstream edges (10, 12) of waste (8) whenever intermittently fed and temporarily stopped;
         waste removing means (34, 36, 60, 62, 74, 76) disposed at a second station predetermined downstream of and at a distance from said first station, said waste (8) reaching said second station when said material (4) is intermittently fed again after partially cut by said partially cutting means (18, 20); and
         discharge means (42, 44) disposed at a third station predetermined downstream of and at a distance from said second station, said material (4) reaching said third station when intermittently fed again after partially cut by said partially cutting means (18, 20), said material (4) being pulled and torn by said discharge means (42, 44) from said downstream edge (12) of waste (8) to be discharged by said discharge means (42, 44) as a plastic bag (2), said waste (8) being pulled, torn and removed by said waste removing means (34, 36, 60, 62, 74, 76) from said upstream edge (10) of waste (8), after said waste (8) reaches said second station and said material (4) reaches said third station.
    2. The apparatus as set forth in claim 1 wherein said partially cutting means comprises Thomson blade means (18, 20) opposed to said material (4), and drive means (26) by which said Thomson blade means (18, 20) is moved toward said material (4) so that said material (4) can be partially cut by said Thomson blade means (18, 20) along said upstream and downstream edges (10, 12) of waste (8).
    3. The apparatus as set forth in claim 2 wherein said Thomson blade means (18, 20) has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints (28, 30) formed and spaced from each other along said upstream and downstream edges (10, 12) of waste (8), said micro joints (28, 30) making said material (4) partially cut, said material (4) and said waste (8) being kept connected with each other by said micro joints (28, 30).
    4. The apparatus as set forth in any one of claims 1 to 3 wherein said material (4) is partially cut by said partially cutting means (18, 20) to be pulled and torn more easily at said downstream edge (12) than at said upstream edge (10) of waste (8), said material (4) being first pulled and torn by said discharge means (42, 44) from said downstream edge (12) of waste (8) after said waste (8) reaches said second station and the material (4) reaches said third station, said waste (8) being then pulled and torn by said waste removing means (34, 36, 60, 62, 74, 76) from said upstream edge (10) of waste (8).
    5. The apparatus as set forth in claim 4 wherein said waste removing means comprises upper and lower rotating members (34, 36) disposed on upper and lower sides of said feeding path, drive means (38) by which at least one of said upper and lower rotating members (34) is moved toward said waste (8) so that said waste (8) can be sandwiched between said upper and lower rotating members (34, 36), and drive means (40) by which at least one of said upper and lower rotating members (36) is rotated at a considerable speed so that said waste (8) can be pulled and torn by said upper and lower rotating members (34, 36).
    6. The apparatus as set forth in claim 5 wherein said discharge means comprises upper and lower belts (42, 44) between which said material (4) is directed and sandwiched to be pulled and torn by said upper and lower belts (42, 44).
    7. The apparatus as set forth in any one of claims 1 to 3 wherein said waste (8) is held by said waste removing means (34, 36) after reaching said second station so that said material (4) can be pulled and torn by said discharge means (42, 44) from said downstream edge (12) of waste (8), said waste (8) being then pulled and torn by said waste removing means (34, 36) from said upstream edge (10) of waste (8).
    8. The apparatus as set forth in claim 7 wherein said waste removing means comprises upper and lower rotating members (34, 36) disposed on upper and lower sides of said feeding path, drive means (68) by which at least one of said upper and lower rotating members (34) is moved toward said waste (8) so that said waste (8) can be sandwiched between and held by said upper and lower rotating members (34, 36) after reaching said second station, and drive means (70, 72) by which at least one of said upper and lower rotating members (36) is rotated at a considerable speed so that said waste (8) can be pulled and torn by said upper and lower rotating members (34, 36).
    9. The apparatus as set forth in claim 8 wherein said discharge means comprises upper and lower belts (42, 44) between which said material (4) is directed and sandwiched to be pulled and torn by said upper and lower belts (42, 44).
    10. The apparatus as set forth in claim 7 wherein said waste removing means comprises upper and lower fingers (74, 76) disposed on upper and lower sides of said feeding path, drive means (78) by which at least one of said upper and lower fingers (74, 76) is moved toward said waste (8) so that said waste (8) can be sandwiched between and held by said upper and lower fingers (74, 76) after reaching said second station, and drive means (82) by which said upper and lower fingers (74, 76) are moved in a direction so that said waste (8) can be pulled and torn by said upper and lower fingers (74, 76).
    11. The apparatus as set forth in claim 10 wherein said discharge means comprises upper and lower belts (42, 44) between which said material (4) is directed and sandwiched to be pulled and torn by said upper and lower belts (42, 44).
    12. The apparatus as set forth in any one of claims 1 to 3 wherein said discharge means comprises upper and lower belts (42, 44) between which said material (4) is directed and sandwiched, and drive means (50) by which said upper and lower belts (42, 44) are driven at a first speed, said waste removing means comprising upper and lower rotating members (34, 36) disposed on upper and lower sides of said feeding path, drive means (38) by which at least one of said upper and lower rotating members (34) is moved toward said waste (8) so that said waste (8) can be sandwiched between said upper and lower rotating members (34, 36) at the same time as said material (4) is sandwiched between said upper and lower belts (42, 44), and drive means (40) by which at least one of said upper and lower rotating members (36) is rotated at a second speed lower than said first speed so that said material (4) is pulled and torn by said upper and lower belts (42, 44), while said waste (8) is pulled and torn by said upper and lower rotating members (34, 36), by means of a difference in speed between said upper and lower belts (42, 44) and said upper and lower rotating members (34, 36).
    13. An apparatus for making plastic bags (2) from a web material (4) comprising two or more layers of plastic film, said apparatus including feeding means (14) by which said material (4) is intermittently fed for a length along a longitudinal feeding path, to successively make plastic bags (2) with wastes (8), each of said wastes (8) having upstream and downstream edges (10, 12), said apparatus characterized by
         partially cutting means (84) combined with totally cutting means (86), said material (4) being partially cut by said partially cutting means (84) along said upstream edge (10) and totally cut by said totally cutting means (86) along said downstream edge (12) of waste (8) whenever intermittently fed and temporarily stopped; and
         discharge means (42, 44) disposed downstream of and at a distance from said partially and totally cutting means (84, 86), said material (4) being discharged by said discharge means (42, 44) as a plastic bag (2) after partially and totally cut, said waste (8) then reaching said discharge means (42, 44) when said material (4) is intermittently fed again, to be pulled, torn and removed by said discharge means (42, 44) from said upstream edge (10) of waste (8).
    14. The apparatus as set forth in claim 13 wherein said partially cutting means comprises Thomson blade means (84) opposed to said material (4), and drive means (26) by which said Thomson blade means (84) is moved toward said material (4) so that said material (4) can be partially cut by said Thomson blade means (84) along said upstream edge (10) of waste (8).
    15. The apparatus as set forth in claim 14 wherein said Thomson blade means (84) has micro depressions formed and spaced from each other along the cutting edge thereof to leave micro joints (28, 30) formed and spaced from each other along said upstream edge (10) of waste (8), said micro joints (28, 30) making said material (4) partially cut, said waste (8) being kept connected with said material (4) by said micro joints (28, 30).
    16. The apparatus as set forth in any one of claims 13 to 15 wherein said discharge means comprises upper and lower belts (42, 44), said material (4) being directed and sandwiched between said upper and lower belts (42, 44) to be discharged by said upper and lower belts (42, 44), said waste (8) being then directed and sandwiched between said upper and lower belts (42, 44) to be pulled, torn and removed by said upper and lower belts (42, 44), stop means (88) being incorporated into said upper and lower belts (42, 44) so that said waste (8) can strike against said stop means (88) for dropping from said upper and lower belts (42, 44).
    EP01250215A 2000-06-15 2001-06-13 Plastic bag making apparatus Expired - Lifetime EP1166978B1 (en)

    Applications Claiming Priority (4)

    Application Number Priority Date Filing Date Title
    JP2000179636 2000-06-15
    JP2000179636 2000-06-15
    JP2000257360A JP3623157B2 (en) 2000-06-15 2000-08-28 Bag making machine
    JP2000257360 2000-08-28

    Publications (3)

    Publication Number Publication Date
    EP1166978A2 EP1166978A2 (en) 2002-01-02
    EP1166978A3 EP1166978A3 (en) 2004-01-02
    EP1166978B1 true EP1166978B1 (en) 2005-10-12

    Family

    ID=26593984

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP01250215A Expired - Lifetime EP1166978B1 (en) 2000-06-15 2001-06-13 Plastic bag making apparatus

    Country Status (8)

    Country Link
    US (2) US6648808B2 (en)
    EP (1) EP1166978B1 (en)
    JP (1) JP3623157B2 (en)
    CN (2) CN1169690C (en)
    AT (1) ATE306373T1 (en)
    DE (1) DE60113922T2 (en)
    DK (1) DK1166978T3 (en)
    HK (2) HK1040968B (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN104290351A (en) * 2014-09-29 2015-01-21 任杰 Plastic bag production device with loosening preventing device

    Families Citing this family (19)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP3619208B2 (en) * 2002-04-26 2005-02-09 トタニ技研工業株式会社 Bottom material folding mechanism of bag making machine
    JP3619228B2 (en) * 2002-11-12 2005-02-09 トタニ技研工業株式会社 Bag making machine
    CN1302915C (en) * 2004-10-29 2007-03-07 覃通衡 Continuous plastic film bag making and sealing machine
    WO2007013338A1 (en) * 2005-07-29 2007-02-01 Matsushita Electric Industrial Co., Ltd. Antenna unit and portable communication device
    US20070295637A1 (en) * 2006-06-22 2007-12-27 Howard Ho Self opening T-shirt bag pack
    CN101746077A (en) * 2008-12-11 2010-06-23 天津锦利程包装有限公司 Cut-off knife for packaging opening of packaging bag
    JP4829364B1 (en) * 2010-05-25 2011-12-07 トタニ技研工業株式会社 Bag making machine
    CN101905760A (en) * 2010-07-21 2010-12-08 陈义忠 Separator paper feeding mechanism for storage battery flaker
    US9505504B2 (en) 2011-02-18 2016-11-29 Pouch Pac Innovations, Llc Apparatus for the two stage filling of flexible pouches
    US9944037B2 (en) * 2011-05-12 2018-04-17 Pouch Pac Innovations, Llc Apparatus for simultaneously separating a plurality of pouches, transferring the pouches and method of same
    JP6025338B2 (en) 2012-02-08 2016-11-16 株式会社フジシールインターナショナル Bag making machine
    CN102795355A (en) * 2012-08-22 2012-11-28 大连巨峰包装制品有限公司 Method for packaging bagged materials
    CN104044951B (en) * 2014-05-04 2016-07-13 无锡鸿昌精密机械有限公司 A kind of bag cutting machine
    JP6517854B2 (en) * 2017-02-08 2019-05-22 本田技研工業株式会社 Product cutting method
    CN107175848B (en) * 2017-05-12 2018-12-25 重庆锦沙沣包装有限公司 More size packages manufacturing machines
    KR200486659Y1 (en) * 2018-01-04 2018-06-18 주식회사 대진씨앤씨 Apparatus for Manufacturing a Plastic Bag
    JP6949768B2 (en) * 2018-03-27 2021-10-13 藤森工業株式会社 Bag making method and bag making machine
    JP7176220B2 (en) * 2018-04-05 2022-11-22 凸版印刷株式会社 Pouch manufacturing method and manufacturing apparatus
    CN113526213B (en) * 2021-07-30 2023-01-31 滕州市中等职业教育中心学校 Page or leaf machine that tears of commodity circulation document production usefulness

    Family Cites Families (16)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE1236314B (en) * 1962-01-10 1967-03-09 Gartemann & Hollmann G M B H Perforating device for machines for the production of multi-walled paper sacks with a staggered bottom end and a straight or staggered filling end
    GB1333161A (en) * 1970-01-30 1973-10-10 Windmoeller & Hoelscher Severing apparatus for severing lengths of tube from flattened scored tubing
    US4033240A (en) * 1975-05-14 1977-07-05 Deslauriers Clovis F Rotary stripping wheel
    JPS529190A (en) * 1975-07-14 1977-01-24 Masaharu Matsuo Conveyer means for driving waste removing claws
    US4096981A (en) * 1977-03-18 1978-06-27 Wilson Jones Company Apparatus for stripping a continuous web of material from the marginal edge of a body
    US4285681A (en) * 1978-01-25 1981-08-25 Union Carbide Corporation Tear resistant separable end-connected bags
    CA1188557A (en) * 1982-10-04 1985-06-11 Roderick A. Bolton Method for making partially separated multibags
    US4529114A (en) * 1983-09-09 1985-07-16 Moore Business Forms, Inc. Form burster
    NL8403057A (en) * 1984-10-08 1986-05-01 Hadewe Bv COMBINED SEPARATION, SEPARATION AND SORTING DEVICE FOR A MULTIPLE CHAIN FORMS JOB.
    US4785696A (en) * 1987-04-03 1988-11-22 Kraft, Inc. High-speed apparatus for forming sheets from a web
    JP3107807B2 (en) * 1990-06-01 2000-11-13 日本石油化学株式会社 Sheet stacking equipment
    JP2578530B2 (en) * 1991-04-16 1997-02-05 峯木 隆良 Die-cut sheet peeling device
    DE4440660C2 (en) * 1994-11-14 1998-12-03 Windmoeller & Hoelscher Separating device for separating perforated hose sections
    DE69820503T2 (en) * 1997-01-30 2004-11-04 Totani Giken Kogyo Co. Ltd. sheet feeder
    JP3344958B2 (en) * 1998-12-28 2002-11-18 トタニ技研工業株式会社 Bag making machine
    US6467382B2 (en) * 2000-02-07 2002-10-22 Spartanics Extractor for extracting cut partially cut parts from a sheet of material

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN104290351A (en) * 2014-09-29 2015-01-21 任杰 Plastic bag production device with loosening preventing device

    Also Published As

    Publication number Publication date
    CN1169690C (en) 2004-10-06
    ATE306373T1 (en) 2005-10-15
    HK1040968A1 (en) 2002-06-28
    HK1040968B (en) 2005-03-18
    JP3623157B2 (en) 2005-02-23
    DE60113922T2 (en) 2006-07-27
    US6648808B2 (en) 2003-11-18
    CN1323011C (en) 2007-06-27
    CN1330023A (en) 2002-01-09
    US20030073557A1 (en) 2003-04-17
    EP1166978A3 (en) 2004-01-02
    JP2002067194A (en) 2002-03-05
    CN1590082A (en) 2005-03-09
    DK1166978T3 (en) 2005-11-07
    EP1166978A2 (en) 2002-01-02
    US20010053737A1 (en) 2001-12-20
    DE60113922D1 (en) 2006-02-23
    HK1073449A1 (en) 2005-10-07

    Similar Documents

    Publication Publication Date Title
    EP1166978B1 (en) Plastic bag making apparatus
    US7044184B2 (en) Plastic bag making apparatus
    EP0283501B1 (en) Apparatus for splicing film together
    US5152205A (en) Rotary shear
    CN110087872B (en) Cutting device and method for cutting a length in a continuous strip to form a tyre component
    EP3974168A1 (en) Bag-manufacturing method and bag-manufacturing device
    JPH08257990A (en) Device for automatically disposing of cut ear
    JP2017205966A (en) Bag making machine
    US5953971A (en) Dual web singulating cutter
    GB1147466A (en) Method and apparatus for producing bags from tubular film
    CA2070324C (en) Method and apparatus for removing waste paper from a continuous web of photographic prints
    US4008639A (en) Device for severing a veneer sheet
    US4033212A (en) Method of and device for severing a veneer sheet
    US5304275A (en) Applying a reinforcement film to sheets
    US3789713A (en) Apparatus for slitting seamless flattened tubes of plastics film
    EP0520529B1 (en) Method and device for removing objects from packages
    JP2000177897A (en) Suction roll and carrier of film
    JPH11246115A (en) Folding device of synthetic resin bag
    US6021698A (en) Stager interface apparatus and method for staging sheets
    US7174819B1 (en) Apparatus and method for cutting a web, feeding it into a processing and threading it up through that line
    JP3299300B2 (en) Slitter
    JPH11278731A (en) Defective sheet eliminating device
    JP2000317893A (en) Rotary boring device for boring hole in continuous strip fed continuously, method for using the same, and rotary bag forming device provided therewith
    WO2005016638A1 (en) Plastic garbage bag, method of manufacturing a plastic garbage bag, apparatus for manufacturing a plastic garbage bag
    JPH01321200A (en) Perforation cutting device

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A2

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    PUAL Search report despatched

    Free format text: ORIGINAL CODE: 0009013

    AK Designated contracting states

    Kind code of ref document: A3

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

    AX Request for extension of the european patent

    Extension state: AL LT LV MK RO SI

    17P Request for examination filed

    Effective date: 20040205

    17Q First examination report despatched

    Effective date: 20040414

    AKX Designation fees paid

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

    GRAP Despatch of communication of intention to grant a patent

    Free format text: ORIGINAL CODE: EPIDOSNIGR1

    RIC1 Information provided on ipc code assigned before grant

    Ipc: 7B 26D 7/18 A

    Ipc: 7B 26F 3/00 B

    Ipc: 7B 31B 1/16 B

    GRAS Grant fee paid

    Free format text: ORIGINAL CODE: EPIDOSNIGR3

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Kind code of ref document: B1

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: NL

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20051012

    Ref country code: BE

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20051012

    Ref country code: FI

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20051012

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: FG4D

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: NV

    Representative=s name: TROESCH SCHEIDEGGER WERNER AG

    Ref country code: CH

    Ref legal event code: EP

    REG Reference to a national code

    Ref country code: IE

    Ref legal event code: FG4D

    REG Reference to a national code

    Ref country code: DK

    Ref legal event code: T3

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: GR

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20060112

    Ref country code: SE

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20060112

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: ES

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20060123

    REF Corresponds to:

    Ref document number: 60113922

    Country of ref document: DE

    Date of ref document: 20060223

    Kind code of ref document: P

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: PT

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20060313

    NLV1 Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act
    ET Fr: translation filed
    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: GB

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20060613

    Ref country code: IE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20060613

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: MC

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20060630

    PLBE No opposition filed within time limit

    Free format text: ORIGINAL CODE: 0009261

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

    26N No opposition filed

    Effective date: 20060713

    GBPC Gb: european patent ceased through non-payment of renewal fee

    Effective date: 20060613

    REG Reference to a national code

    Ref country code: IE

    Ref legal event code: MM4A

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: LU

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20060613

    Ref country code: TR

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20051012

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: CY

    Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

    Effective date: 20051012

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: PLFP

    Year of fee payment: 16

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: PLFP

    Year of fee payment: 17

    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: PLFP

    Year of fee payment: 18

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: CH

    Payment date: 20180621

    Year of fee payment: 18

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: DK

    Payment date: 20180620

    Year of fee payment: 18

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: DE

    Payment date: 20190619

    Year of fee payment: 19

    Ref country code: IT

    Payment date: 20190624

    Year of fee payment: 19

    PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

    Ref country code: FR

    Payment date: 20190619

    Year of fee payment: 19

    REG Reference to a national code

    Ref country code: DK

    Ref legal event code: EBP

    Effective date: 20190630

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: PL

    REG Reference to a national code

    Ref country code: AT

    Ref legal event code: MM01

    Ref document number: 306373

    Country of ref document: AT

    Kind code of ref document: T

    Effective date: 20190613

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: AT

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20190613

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: CH

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20190630

    Ref country code: LI

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20190630

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: DK

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20190630

    REG Reference to a national code

    Ref country code: DE

    Ref legal event code: R119

    Ref document number: 60113922

    Country of ref document: DE

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: FR

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20200630

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: DE

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20210101

    PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

    Ref country code: IT

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

    Effective date: 20200613